// Copyright (c) 2026, Pim van Pelt <pim@ipng.ch>

package main

import "encoding/json"

// StateSnapshot is the full JSON snapshot served for a single maglevd.
type StateSnapshot struct {
	Maglevd      MaglevdInfo            `json:"maglevd"`
	Frontends    []*FrontendSnapshot    `json:"frontends"`
	Backends     []*BackendSnapshot     `json:"backends"`
	HealthChecks []*HealthCheckSnapshot `json:"healthchecks"`
	VPPInfo      *VPPInfoSnapshot       `json:"vpp_info,omitempty"`
}

// MaglevdInfo is the per-maglevd connection status record.
type MaglevdInfo struct {
	Name      string `json:"name"`
	Address   string `json:"address"`
	Connected bool   `json:"connected"`
	LastError string `json:"last_error,omitempty"`
}

// VersionInfo is the build metadata of this maglev-frontend binary.
type VersionInfo struct {
	Version string `json:"version"`
	Commit  string `json:"commit"`
	Date    string `json:"date"`
}

type FrontendSnapshot struct {
	Name        string          `json:"name"`
	Address     string          `json:"address"`
	Protocol    string          `json:"protocol"`
	Port        uint32          `json:"port"`
	Description string          `json:"description,omitempty"`
	SrcIPSticky bool            `json:"src_ip_sticky"`
	Pools       []*PoolSnapshot `json:"pools"`
}

type PoolSnapshot struct {
	Name     string                 `json:"name"`
	Backends []*PoolBackendSnapshot `json:"backends"`
}

type PoolBackendSnapshot struct {
	Name            string `json:"name"`
	Weight          int32  `json:"weight"`
	EffectiveWeight int32  `json:"effective_weight"`
}

type BackendSnapshot struct {
	Name           string              `json:"name"`
	Address        string              `json:"address"`
	State          string              `json:"state"`
	Enabled        bool                `json:"enabled"`
	HealthCheck    string              `json:"healthcheck"`
	LastTransition *TransitionRecord   `json:"last_transition,omitempty"`
	Transitions    []*TransitionRecord `json:"transitions,omitempty"`
}

type TransitionRecord struct {
	From     string `json:"from"`
	To       string `json:"to"`
	AtUnixNs int64  `json:"at_unix_ns"`
}

type HealthCheckSnapshot struct {
	Name           string `json:"name"`
	Type           string `json:"type"`
	Port           uint32 `json:"port"`
	IntervalNs     int64  `json:"interval_ns"`
	FastIntervalNs int64  `json:"fast_interval_ns"`
	DownIntervalNs int64  `json:"down_interval_ns"`
	TimeoutNs      int64  `json:"timeout_ns"`
	Rise           int32  `json:"rise"`
	Fall           int32  `json:"fall"`
}

type VPPInfoSnapshot struct {
	Version       string `json:"version"`
	BuildDate     string `json:"build_date"`
	PID           uint32 `json:"pid"`
	BoottimeNs    int64  `json:"boottime_ns"`
	ConnecttimeNs int64  `json:"connecttime_ns"`
}

// BrowserEvent is the wire shape sent over SSE to the browser.
type BrowserEvent struct {
	Maglevd  string          `json:"maglevd"`
	Type     string          `json:"type"` // log|backend|frontend|maglevd-status|resync
	AtUnixNs int64           `json:"at_unix_ns"`
	Payload  json.RawMessage `json:"payload"`
}

// BackendEventPayload is what we ship inside BrowserEvent.Payload for
// type == "backend".
type BackendEventPayload struct {
	Backend    string           `json:"backend"`
	Transition TransitionRecord `json:"transition"`
}

type FrontendEventPayload struct {
	Frontend   string           `json:"frontend"`
	Transition TransitionRecord `json:"transition"`
}

type LogEventPayload struct {
	Level string            `json:"level"`
	Msg   string            `json:"msg"`
	Attrs map[string]string `json:"attrs,omitempty"`
}

type MaglevdStatusPayload struct {
	Connected bool   `json:"connected"`
	LastError string `json:"last_error,omitempty"`
}